JPS61148750U

JPS61148750U -

Info

Publication number: JPS61148750U
Application number: JP3389785U
Authority: JP
Priority date: 1985-03-08
Filing date: 1985-03-08
Publication date: 1986-09-13

Description

[Brief explanation of the drawing]

第１図に本考案の一実施例の弁装置の詳細を示
す断面図、第２図は第１図の弁装置を備えたマス
タシリンダの断面図、第３図は他実施例の第１図
に相当する断面図、第４図は従来弁装置の断面図
である。符号の説明、１０……シリンダーボデー、１０
ｄ……インレツトボス部、１１……段付ピストン
、１１ｃ……段付ピストンの孔、１６……カツプ
シール、１７……大径環状圧力室、１８……小径
圧力室、３３……リザーバ、３３ｂ……接続管部
、３７……弁装置、３９……第２弁体、４０……
弁座体、４２……第１弁体、４２……スプリング
、４６……液吸入路を構成する通路、４７……絞
り通路。 Fig. 1 is a sectional view showing details of a valve device according to one embodiment of the present invention, Fig. 2 is a sectional view of a master cylinder equipped with the valve device shown in Fig. 1, and Fig. 3 is a sectional view showing details of a valve device according to an embodiment of the present invention. FIG. 4 is a sectional view of a conventional valve device. Explanation of symbols, 10... Cylinder body, 10
d...Inlet boss portion, 11...Stepped piston, 11c...Stepped piston hole, 16...Cup seal, 17...Large diameter annular pressure chamber, 18...Small diameter pressure chamber, 33...Reservoir, 33b... ... Connection pipe section, 37 ... Valve device, 39 ... Second valve body, 40 ...
Valve seat body, 42...first valve body, 42...spring, 46...passage forming a liquid suction path, 47...throttle passage.

Claims

[Scope of utility model registration request]

A small-diameter pressure chamber and a large-diameter annular pressure chamber whose pressure increases due to the operation of the stepped piston, and when the pressure increase in the large-diameter annular pressure chamber reaches a relatively low predetermined pressure, liquid is released from the large-diameter annular pressure chamber to the reservoir. a first valve mechanism that opens a passage, and a second valve mechanism that opens a liquid suction passage from the reservoir to the large-diameter annular pressure chamber in response to negative pressure in the large-diameter annular pressure chamber; A throttle communication passage is provided that constantly communicates the chamber with the reservoir, and when the stepped piston is operated, the pressure fluid in the large diameter annular pressure chamber is forced into the small diameter pressure chamber through the outer circumferential side of a cup seal attached to the stepped piston. In this master cylinder, the valve device is fitted and fixed into the connecting pipe portion of the reservoir, which is fitted into the inlet boss portion of the master cylinder body with a seal interposed therebetween, and the valve device is discharged together with the pressure liquid from the small diameter pressure chamber. A master cylinder valve device in which a communicating passage is formed on the inner periphery of the connecting pipe portion.